nsz Git - libfirm/blob - ir/ir/iredges.c

   1 /*
   2  * Copyright (C) 1995-2011 University of Karlsruhe.  All right reserved.
   3  *
   4  * This file is part of libFirm.
   5  *
   6  * This file may be distributed and/or modified under the terms of the
   7  * GNU General Public License version 2 as published by the Free Software
   8  * Foundation and appearing in the file LICENSE.GPL included in the
   9  * packaging of this file.
  10  *
  11  * Licensees holding valid libFirm Professional Edition licenses may use
  12  * this file in accordance with the libFirm Commercial License.
  13  * Agreement provided with the Software.
  14  *
  15  * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
  16  * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE.
  18  */
  19
  20 /**
  21  * @file
  22  * @brief   Always available outs.
  23  * @author  Sebastian Hack, Michael Beck, Andreas Schoesser
  24  * @date    14.1.2005
  25  * @brief
  26  *   This are out-edges (also called def-use edges) that are dynamically
  27  *   updated as the graph changes.
  28  */
  29 #include "config.h"
  30
  31 #include "irnode_t.h"
  32 #include "iropt_t.h"
  33 #include "iredgekinds.h"
  34 #include "iredges_t.h"
  35 #include "irgwalk.h"
  36 #include "irdump_t.h"
  37 #include "irprintf.h"
  38 #include "debug.h"
  39 #include "set.h"
  40 #include "bitset.h"
  41 #include "error.h"
  42 #include "irpass_t.h"
  43
  44 #include "iredgeset.h"
  45 #include "hashptr.h"
  46
  47 #define DO_REHASH
  48 #define SCALAR_RETURN
  49 #define HashSet                   ir_edgeset_t
  50 #define HashSetIterator           ir_edgeset_iterator_t
  51 #define ValueType                 ir_edge_t*
  52 #define NullValue                 NULL
  53 #define DeletedValue              ((ir_edge_t*)-1)
  54 #define Hash(this,key)            (hash_ptr(key->src) ^ (key->pos * 40013))
  55 #define KeysEqual(this,key1,key2) ((key1->src) == (key2->src) && (key1->pos == key2->pos))
  56 #define SetRangeEmpty(ptr,size)   memset(ptr, 0, (size) * sizeof((ptr)[0]))
  57
  58 #define hashset_init            ir_edgeset_init
  59 void ir_edgeset_init_size(ir_edgeset_t *self, size_t size);
  60 #define hashset_init_size       ir_edgeset_init_size
  61 #define hashset_destroy         ir_edgeset_destroy
  62 #define hashset_insert          ir_edgeset_insert
  63 #define hashset_remove          ir_edgeset_remove
  64 ir_edge_t *ir_edgeset_find(const ir_edgeset_t *self, const ir_edge_t*);
  65 #define hashset_find            ir_edgeset_find
  66 size_t ir_edgeset_size(const ir_edgeset_t *self);
  67 #define hashset_size            ir_edgeset_size
  68 #define hashset_iterator_init   ir_edgeset_iterator_init
  69 #define hashset_iterator_next   ir_edgeset_iterator_next
  70 #define hashset_remove_iterator ir_edgeset_remove_iterator
  71
  72 #include "hashset.c.inl"
  73
  74 /**
  75  * A function that allows for setting an edge.
  76  * This abstraction is necessary since different edge kind have
  77  * different methods of setting edges.
  78  */
  79 typedef void (set_edge_func_t)(ir_node *src, int pos, ir_node *tgt);
  80
  81 /**
  82  * A function that returns the "arity" of a given edge kind
  83  * for a node.
  84  */
  85 typedef int (get_edge_src_arity_func_t)(const ir_node *src);
  86
  87 /**
  88  * A function that returns the pos'th edge of a given edge kind for a node.
  89  */
  90 typedef ir_node *(get_edge_src_n_func_t)(const ir_node *src, int pos);
  91
  92 /**
  93  * Additional data for an edge kind.
  94  */
  95 typedef struct {
  96         const char                *name;       /**< name of this edge kind */
  97         set_edge_func_t           *set_edge;   /**< the set_edge function */
  98         int                       first_idx;   /**< index of the first possible edge */
  99         get_edge_src_arity_func_t *get_arity;  /**< the get_arity function */
 100         get_edge_src_n_func_t     *get_n;      /**< the get_n function */
 101 } ir_edge_kind_info_t;
 102
 103 /**
 104  * Get the predecessor block.
 105  */
 106 static ir_node *get_block_n(const ir_node *block, int pos)
 107 {
 108         if (is_Block(block))
 109                 return get_Block_cfgpred_block(block, pos);
 110         /* might be a Bad */
 111         return NULL;
 112 }
 113
 114 static ir_node *get_irn_safe_n(const ir_node *node, int n)
 115 {
 116         if (n == -1 && is_Block(node))
 117                 return NULL;
 118         return get_irn_n(node, n);
 119 }
 120
 121 static const ir_edge_kind_info_t edge_kind_info[EDGE_KIND_LAST] = {
 122         { "normal"     , set_irn_n,   -1, get_irn_arity,  get_irn_safe_n },
 123         { "block succs", NULL,         0, get_irn_arity,  get_block_n    },
 124         { "dependency",  set_irn_dep,  0, get_irn_deps,   get_irn_dep    }
 125 };
 126
 127 #define foreach_tgt(irn, i, n, kind) for (i = edge_kind_info[kind].first_idx, n = edge_kind_info[kind].get_arity(irn); i < n; ++i)
 128 #define get_n(irn, pos, kind)        (edge_kind_info[kind].get_n(irn, pos))
 129 #define get_kind_str(kind)           (edge_kind_info[kind].name)
 130
 131 DEBUG_ONLY(static firm_dbg_module_t *dbg;)
 132
 133 /**
 134  * This flag is set to 1, if the edges get initialized for an irg.
 135  * Then register additional data is forbidden.
 136  */
 137 static int edges_used = 0;
 138
 139 /**
 140  * If set to 1, the list heads are checked every time an edge is changed.
 141  */
 142 static int edges_dbg = 0;
 143
 144 /**
 145  * Returns an ID for the given edge.
 146  */
 147 static inline long edge_get_id(const ir_edge_t *e)
 148 {
 149         return (long)e;
 150 }
 151
 152 void edges_init_graph_kind(ir_graph *irg, ir_edge_kind_t kind)
 153 {
 154         if (edges_activated_kind(irg, kind)) {
 155                 irg_edge_info_t *info = get_irg_edge_info(irg, kind);
 156                 size_t amount = irg->estimated_node_count * 2;
 157
 158                 edges_used = 1;
 159                 if (info->allocated) {
 160                         amount = ir_edgeset_size(&info->edges);
 161                         ir_edgeset_destroy(&info->edges);
 162                         obstack_free(&info->edges_obst, NULL);
 163                 }
 164                 obstack_init(&info->edges_obst);
 165                 INIT_LIST_HEAD(&info->free_edges);
 166                 ir_edgeset_init_size(&info->edges, amount);
 167                 info->allocated = 1;
 168         }
 169 }
 170
 171 const ir_edge_t *get_irn_edge_kind(const ir_node *src, int pos, ir_edge_kind_t kind)
 172 {
 173         ir_graph *irg = get_irn_irg(src);
 174         if (edges_activated_kind(irg, kind)) {
 175                 irg_edge_info_t *info = get_irg_edge_info(irg, kind);
 176                 ir_edge_t       key;
 177
 178                 key.src = (ir_node *)src;
 179                 key.pos = pos;
 180
 181                 return ir_edgeset_find(&info->edges, &key);
 182         }
 183
 184         return NULL;
 185 }
 186
 187 /**
 188  * Change the out count
 189  *
 190  * @param tgt  the edge target
 191  * @param kind the kind of the edge
 192  */
 193 static inline void edge_change_cnt(ir_node *tgt, ir_edge_kind_t kind, int ofs)
 194 {
 195         irn_edge_info_t *info = get_irn_edge_info(tgt, kind);
 196         info->out_count += ofs;
 197 }
 198
 199 /**
 200  * Verify the edge list of a node, ie. ensure it's a loop:
 201  * head -> e_1 -> ... -> e_n -> head
 202  */
 203 static inline void verify_list_head(ir_node *irn, ir_edge_kind_t kind)
 204 {
 205         int                    err     = 0;
 206         int                    num     = 0;
 207         pset                   *lh_set = pset_new_ptr(16);
 208         const struct list_head *head   = &get_irn_edge_info(irn, kind)->outs_head;
 209         const struct list_head *pos;
 210
 211         list_for_each(pos, head) {
 212                 if (pset_find_ptr(lh_set, pos)) {
 213                         const ir_edge_t *edge = list_entry(pos, ir_edge_t, list);
 214
 215                         ir_fprintf(stderr, "EDGE Verifier: edge list broken (self loop not to head) for %+F:\n", irn);
 216                         fprintf(stderr, "- at list entry %d\n", num);
 217                         if (edge->invalid)
 218                                 fprintf(stderr, "- edge(%ld) is invalid\n", edge_get_id(edge));
 219                         if (edge->src)
 220                                 ir_fprintf(stderr, "- edge(%ld) %+F(%d)\n", edge_get_id(edge), edge->src, edge->pos);
 221                         err = 1;
 222                         break;
 223                 }
 224                 num++;
 225                 pset_insert_ptr(lh_set, pos);
 226         }
 227
 228         del_pset(lh_set);
 229
 230         assert(err == 0);
 231 }
 232
 233 void edges_dump_kind(ir_graph *irg, ir_edge_kind_t kind)
 234 {
 235         irg_edge_info_t *info;
 236         ir_edgeset_t    *edges;
 237         ir_edgeset_iterator_t iter;
 238         ir_edge_t      *e;
 239
 240         if (!edges_activated_kind(irg, kind))
 241                 return;
 242
 243         info  = get_irg_edge_info(irg, kind);
 244         edges = &info->edges;
 245         foreach_ir_edgeset(edges, e, iter) {
 246                 ir_printf("%+F %d %d\n", e->src, e->pos, e->invalid);
 247         }
 248 }
 249
 250 void edges_notify_edge_kind(ir_node *src, int pos, ir_node *tgt,
 251                             ir_node *old_tgt, ir_edge_kind_t kind,
 252                             ir_graph *irg)
 253 {
 254         const char      *msg = "";
 255         irg_edge_info_t *info;
 256         ir_edgeset_t    *edges;
 257         ir_edge_t        templ;
 258
 259         assert(edges_activated_kind(irg, kind));
 260
 261         /*
 262          * Only do something, if the old and new target differ.
 263          */
 264         if (tgt == old_tgt)
 265                 return;
 266
 267         info  = get_irg_edge_info(irg, kind);
 268         edges = &info->edges;
 269
 270         /* Initialize the edge template to search in the set. */
 271         templ.src = src;
 272         templ.pos = pos;
 273
 274         /*
 275          * If the target is NULL, the edge shall be deleted.
 276          */
 277         if (tgt == NULL) {
 278                 /* search the edge in the set. */
 279                 ir_edge_t *edge = ir_edgeset_find(edges, &templ);
 280
 281                 /* mark the edge invalid if it was found */
 282                 if (edge) {
 283                         msg = "deleting";
 284                         list_del(&edge->list);
 285                         ir_edgeset_remove(edges, edge);
 286                         list_add(&edge->list, &info->free_edges);
 287                         edge->invalid = 1;
 288                         edge->pos = -2;
 289                         edge->src = NULL;
 290                         edge_change_cnt(old_tgt, kind, -1);
 291                 } else {
 292                         /* If the edge was not found issue a warning on the debug stream */
 293                         msg = "edge to delete not found!\n";
 294                 }
 295         } else {
 296                 /*
 297                  * The target is not NULL and the old target differs
 298                  * from the new target, the edge shall be moved (if the
 299                  * old target was != NULL) or added (if the old target was
 300                  * NULL).
 301                  */
 302                 struct list_head *head = &get_irn_edge_info(tgt, kind)->outs_head;
 303
 304                 assert(head->next && head->prev &&
 305                                 "target list head must have been initialized");
 306
 307                 /* If the old target is not null, the edge is moved. */
 308                 if (old_tgt) {
 309                         ir_edge_t *edge = ir_edgeset_find(edges, &templ);
 310                         assert(edge && "edge to redirect not found!");
 311                         assert(! edge->invalid && "Invalid edge encountered");
 312
 313                         msg = "redirecting";
 314
 315                         list_move(&edge->list, head);
 316                         edge_change_cnt(old_tgt, kind, -1);
 317                 } else {
 318                         /* The old target was NULL, thus, the edge is newly created. */
 319                         ir_edge_t *new_edge;
 320                         ir_edge_t *edge;
 321
 322                         if (list_empty(&info->free_edges)) {
 323                                 edge = OALLOC(&info->edges_obst, ir_edge_t);
 324                         } else {
 325                                 edge = list_entry(info->free_edges.next, ir_edge_t, list);
 326                                 list_del(&edge->list);
 327                         }
 328
 329                         edge->src       = src;
 330                         edge->pos       = pos;
 331                         edge->invalid   = 0;
 332                         edge->present   = 0;
 333                         edge->kind      = kind;
 334                         edge->list.next = NULL;
 335                         edge->list.prev = NULL;
 336
 337                         new_edge = ir_edgeset_insert(edges, edge);
 338                         if (new_edge != edge) {
 339                                 panic("new edge exists already");
 340                         }
 341
 342                         msg = "adding";
 343                         list_add(&edge->list, head);
 344                 }
 345
 346                 edge_change_cnt(tgt, kind, +1);
 347         }
 348
 349 #ifndef DEBUG_libfirm
 350         /* verify list heads */
 351         if (edges_dbg) {
 352                 if (tgt)
 353                         verify_list_head(tgt, kind);
 354                 if (old_tgt)
 355                         verify_list_head(old_tgt, kind);
 356         }
 357 #endif
 358
 359         DBG((dbg, LEVEL_5, "announce out edge: %+F %d-> %+F(%+F): %s\n", src, pos, tgt, old_tgt, msg));
 360 }
 361
 362 void edges_notify_edge(ir_node *src, int pos, ir_node *tgt, ir_node *old_tgt,
 363                        ir_graph *irg)
 364 {
 365         if (edges_activated_kind(irg, EDGE_KIND_NORMAL)) {
 366                 edges_notify_edge_kind(src, pos, tgt, old_tgt, EDGE_KIND_NORMAL, irg);
 367         }
 368
 369         if (edges_activated_kind(irg, EDGE_KIND_BLOCK)) {
 370                 if (is_Block(src)) {
 371                         ir_node *bl_old = old_tgt ? get_nodes_block(old_tgt) : NULL;
 372                         ir_node *bl_tgt = NULL;
 373
 374                         if (tgt)
 375                                 bl_tgt = is_Bad(tgt) ? tgt : get_nodes_block(tgt);
 376
 377                         edges_notify_edge_kind(src, pos, bl_tgt, bl_old, EDGE_KIND_BLOCK, irg);
 378                 } else if (get_irn_mode(src) == mode_X && old_tgt != NULL && is_Block(old_tgt)) {
 379                         /* moving a jump node from one block to another */
 380                         foreach_out_edge_kind_safe(old_tgt, edge, EDGE_KIND_BLOCK) {
 381                                 ir_node *succ       = get_edge_src_irn(edge);
 382                                 int      succ_pos   = get_edge_src_pos(edge);
 383                                 ir_node *block_pred = get_Block_cfgpred(succ, succ_pos);
 384                                 if (block_pred != src)
 385                                         continue;
 386                                 edges_notify_edge_kind(succ, succ_pos, tgt, old_tgt,
 387                                                        EDGE_KIND_BLOCK, irg);
 388                         }
 389                 }
 390         }
 391 }
 392
 393 /**
 394  * Delete all in edges of a given kind from the node old.
 395  *
 396  * @param old   the node
 397  * @param kind  the kind of edges to remove
 398  * @param irg   the irg of the old node
 399  */
 400 static void edges_node_deleted_kind(ir_node *old, ir_edge_kind_t kind)
 401 {
 402         int i, n;
 403         ir_graph *irg = get_irn_irg(old);
 404
 405         if (!edges_activated_kind(irg, kind))
 406                 return;
 407
 408         DBG((dbg, LEVEL_5, "node deleted (kind: %s): %+F\n", get_kind_str(kind), old));
 409
 410         foreach_tgt(old, i, n, kind) {
 411                 ir_node *old_tgt = get_n(old, i, kind);
 412                 edges_notify_edge_kind(old, i, NULL, old_tgt, kind, irg);
 413         }
 414 }
 415
 416 /**
 417  * A node might be revivaled by CSE. Assure its edges.
 418  *
 419  * @param irn   the node
 420  * @param kind  the kind of edges to remove
 421  * @param irg   the irg of the old node
 422  */
 423 static void edges_node_revival_kind(ir_node *irn, ir_edge_kind_t kind)
 424 {
 425         irn_edge_info_t *info;
 426         int             i, n;
 427         ir_graph        *irg = get_irn_irg(irn);
 428
 429         if (!edges_activated_kind(irg, kind))
 430                 return;
 431
 432         info = get_irn_edge_info(irn, kind);
 433         if (info->edges_built)
 434                 return;
 435
 436         DBG((dbg, LEVEL_5, "node revivaled (kind: %s): %+F\n", get_kind_str(kind), irn));
 437
 438         foreach_tgt(irn, i, n, kind) {
 439                 ir_node *tgt = get_n(irn, i, kind);
 440                 edges_notify_edge_kind(irn, i, tgt, NULL, kind, irg);
 441         }
 442         info->edges_built = 1;
 443 }
 444
 445 typedef struct build_walker {
 446         ir_edge_kind_t kind;
 447         bitset_t       *reachable;
 448         unsigned       problem_found;
 449 } build_walker;
 450
 451 /**
 452  * Post-Walker: notify all edges
 453  */
 454 static void build_edges_walker(ir_node *irn, void *data)
 455 {
 456         build_walker          *w = (build_walker*)data;
 457         int                   i, n;
 458         ir_edge_kind_t        kind = w->kind;
 459         ir_graph              *irg = get_irn_irg(irn);
 460
 461         foreach_tgt(irn, i, n, kind) {
 462                 ir_node *pred = get_n(irn, i, kind);
 463                 edges_notify_edge_kind(irn, i, pred, NULL, kind, irg);
 464         }
 465         get_irn_edge_info(irn, kind)->edges_built = 1;
 466 }
 467
 468 /**
 469  * Pre-Walker: initializes the list-heads and set the out-count
 470  * of all nodes to 0.
 471  */
 472 static void init_lh_walker(ir_node *irn, void *data)
 473 {
 474         build_walker   *w    = (build_walker*)data;
 475         ir_edge_kind_t  kind = w->kind;
 476         list_head      *head = &get_irn_edge_info(irn, kind)->outs_head;
 477         INIT_LIST_HEAD(head);
 478         get_irn_edge_info(irn, kind)->edges_built = 0;
 479         get_irn_edge_info(irn, kind)->out_count   = 0;
 480 }
 481
 482 /**
 483  * Pre-Walker: initializes the list-heads and set the out-count
 484  * of all nodes to 0.
 485  *
 486  * Additionally touches DEP nodes, as they might be DEAD.
 487  * THIS IS UGLY, but I don't find a better way until we
 488  *
 489  * a) ensure that dead nodes are not used as input
 490  * b) it might be sufficient to add those stupid NO_REG nodes
 491  * to the anchor
 492  */
 493 static void init_lh_walker_dep(ir_node *irn, void *data)
 494 {
 495         build_walker   *w    = (build_walker*)data;
 496         ir_edge_kind_t  kind = w->kind;
 497         list_head      *head = &get_irn_edge_info(irn, kind)->outs_head;
 498         int             i;
 499
 500         INIT_LIST_HEAD(head);
 501         get_irn_edge_info(irn, kind)->edges_built = 0;
 502         get_irn_edge_info(irn, kind)->out_count   = 0;
 503
 504         for (i = get_irn_deps(irn) - 1; i >= 0; --i) {
 505                 ir_node *dep = get_irn_dep(irn, i);
 506
 507                 head = &get_irn_edge_info(dep, kind)->outs_head;
 508
 509                 INIT_LIST_HEAD(head);
 510                 get_irn_edge_info(dep, kind)->edges_built = 0;
 511                 get_irn_edge_info(dep, kind)->out_count   = 0;
 512         }
 513 }
 514
 515 typedef struct visitor_info_t {
 516         irg_walk_func *visit;
 517         void *data;
 518 } visitor_info_t;
 519
 520 /**
 521  * Visitor: initializes the list-heads and set the out-count
 522  * of all nodes to 0 of nodes that are not seen so far.
 523  */
 524 static void visitor(ir_node *irn, void *data)
 525 {
 526         visitor_info_t *info = (visitor_info_t*)data;
 527
 528         if (is_Deleted(irn))
 529                 return;
 530         if (!is_Block(irn) && is_Deleted(get_nodes_block(irn)))
 531                 return;
 532
 533         if (!irn_visited_else_mark(irn)) {
 534                 info->visit(irn, info->data);
 535         }
 536 }
 537
 538 void edges_activate_kind(ir_graph *irg, ir_edge_kind_t kind)
 539 {
 540         /*
 541          * Build the initial edge set.
 542          * Beware, this is not a simple task because it suffers from two
 543          * difficulties:
 544          * - the anchor set allows access to Nodes that may not be reachable from
 545          *   the End node
 546          * - the identities add nodes to the "root set" that are not yet reachable
 547          *   from End. However, after some transformations, the CSE may revival these
 548          *   nodes
 549          *
 550          * These problems can be fixed using different strategies:
 551          * - Add an age flag to every node. Whenever the edge of a node is older
 552          *   then the current edge, invalidate the edges of this node.
 553          *   While this would help for revivaled nodes, it increases memory and runtime.
 554          * - Delete the identities set.
 555          *   Solves the revival problem, but may increase the memory consumption, as
 556          *   nodes cannot be revivaled at all.
 557          * - Manually iterate over the identities root set. This did not consume more memory
 558          *   but increase the computation time because the |identities| >= |V|
 559          *
 560          * Currently, we use the last option.
 561          */
 562         struct build_walker w;
 563         irg_edge_info_t     *info = get_irg_edge_info(irg, kind);
 564         visitor_info_t      visit;
 565
 566         w.kind = kind;
 567
 568         visit.data = &w;
 569
 570         assert(!info->activated);
 571
 572         info->activated = 1;
 573         edges_init_graph_kind(irg, kind);
 574         if (kind == EDGE_KIND_DEP) {
 575                 irg_walk_anchors(irg, init_lh_walker_dep, NULL, &w);
 576                 /* Argh: Dep nodes might be dead, so we MUST visit identities first */
 577                 visit.visit = init_lh_walker_dep;
 578                 visit_all_identities(irg, visitor, &visit);
 579                 irg_walk_anchors(irg, NULL, build_edges_walker, &w);
 580         } else {
 581                 visit.visit = init_lh_walker;
 582                 visit_all_identities(irg, visitor, &visit);
 583                 irg_walk_anchors(irg, init_lh_walker, build_edges_walker, &w);
 584         }
 585 }
 586
 587 void edges_deactivate_kind(ir_graph *irg, ir_edge_kind_t kind)
 588 {
 589         irg_edge_info_t *info = get_irg_edge_info(irg, kind);
 590
 591         info->activated = 0;
 592         if (info->allocated) {
 593                 obstack_free(&info->edges_obst, NULL);
 594                 ir_edgeset_destroy(&info->edges);
 595                 info->allocated = 0;
 596         }
 597         clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUT_EDGES);
 598 }
 599
 600 int (edges_activated_kind)(const ir_graph *irg, ir_edge_kind_t kind)
 601 {
 602         return edges_activated_kind_(irg, kind);
 603 }
 604
 605 void edges_reroute_kind(ir_node *from, ir_node *to, ir_edge_kind_t kind)
 606 {
 607         ir_graph *irg = get_irn_irg(from);
 608         set_edge_func_t *set_edge = edge_kind_info[kind].set_edge;
 609
 610         if (set_edge && edges_activated_kind(irg, kind)) {
 611                 struct list_head *head = &get_irn_edge_info(from, kind)->outs_head;
 612
 613                 DBG((dbg, LEVEL_5, "reroute from %+F to %+F\n", from, to));
 614
 615                 while (head != head->next) {
 616                         ir_edge_t *edge = list_entry(head->next, ir_edge_t, list);
 617                         assert(edge->pos >= -1);
 618                         set_edge(edge->src, edge->pos, to);
 619                 }
 620         }
 621 }
 622
 623 void edges_reroute_except(ir_node *from, ir_node *to, ir_node *exception)
 624 {
 625         foreach_out_edge_safe(from, edge) {
 626                 ir_node *src = get_edge_src_irn(edge);
 627                 if (src == exception)
 628                         continue;
 629                 set_irn_n(src, edge->pos, to);
 630         }
 631 }
 632
 633 static void verify_set_presence(ir_node *irn, void *data)
 634 {
 635         build_walker *w     = (build_walker*)data;
 636         ir_graph     *irg   = get_irn_irg(irn);
 637         ir_edgeset_t *edges = &get_irg_edge_info(irg, w->kind)->edges;
 638         int i, n;
 639
 640         foreach_tgt(irn, i, n, w->kind) {
 641                 ir_edge_t templ, *e;
 642
 643                 templ.src = irn;
 644                 templ.pos = i;
 645
 646                 e = ir_edgeset_find(edges, &templ);
 647                 if (e != NULL) {
 648                         e->present = 1;
 649                 } else {
 650                         w->problem_found = 1;
 651                 }
 652         }
 653 }
 654
 655 static void verify_list_presence(ir_node *irn, void *data)
 656 {
 657         build_walker *w = (build_walker*)data;
 658
 659         bitset_set(w->reachable, get_irn_idx(irn));
 660
 661         /* check list heads */
 662         verify_list_head(irn, w->kind);
 663
 664         foreach_out_edge_kind(irn, e, w->kind) {
 665                 ir_node *tgt;
 666
 667                 if (w->kind == EDGE_KIND_NORMAL && get_irn_arity(e->src) <= e->pos) {
 668                         w->problem_found = 1;
 669                         continue;
 670                 }
 671
 672                 tgt = get_n(e->src, e->pos, w->kind);
 673
 674                 if (irn != tgt) {
 675                         w->problem_found = 1;
 676                 }
 677         }
 678 }
 679
 680 int edges_verify_kind(ir_graph *irg, ir_edge_kind_t kind)
 681 {
 682         struct build_walker w;
 683         ir_edgeset_t        *edges = &get_irg_edge_info(irg, kind)->edges;
 684         ir_edge_t           *e;
 685         ir_edgeset_iterator_t  iter;
 686
 687         w.kind          = kind;
 688         w.reachable     = bitset_alloca(get_irg_last_idx(irg));
 689         w.problem_found = 0;
 690
 691         /* Clear the present bit in all edges available. */
 692         foreach_ir_edgeset(edges, e, iter) {
 693                 e->present = 0;
 694         }
 695
 696         irg_walk_graph(irg, verify_set_presence, verify_list_presence, &w);
 697
 698         /*
 699          * Dump all edges which are not invalid and not present.
 700          * These edges are superfluous and their presence in the
 701          * edge set is wrong.
 702          */
 703         foreach_ir_edgeset(edges, e, iter) {
 704                 if (! e->invalid && ! e->present && bitset_is_set(w.reachable, get_irn_idx(e->src))) {
 705                         w.problem_found = 1;
 706                         ir_fprintf(stderr, "Edge Verifier: edge(%ld) %+F,%d is superfluous\n", edge_get_id(e), e->src, e->pos);
 707                 }
 708         }
 709
 710         return w.problem_found;
 711 }
 712
 713 #define IGNORE_NODE(irn) (is_Bad((irn)) || is_Block((irn)))
 714
 715 /**
 716  * Clear link field of all nodes.
 717  */
 718 static void clear_links(ir_node *irn, void *env)
 719 {
 720         bitset_t     *bs;
 721         ir_graph     *irg;
 722         (void) env;
 723
 724         if (IGNORE_NODE(irn)) {
 725                 set_irn_link(irn, NULL);
 726                 return;
 727         }
 728
 729         irg = get_irn_irg(irn);
 730         bs  = bitset_malloc(get_irg_last_idx(irg));
 731         set_irn_link(irn, bs);
 732 }
 733
 734 /**
 735  * Increases count (stored in link field) for all operands of a node.
 736  */
 737 static void count_user(ir_node *irn, void *env)
 738 {
 739         int i;
 740         int first;
 741         (void) env;
 742
 743         first = is_Block(irn) ? 0 : -1;
 744         for (i = get_irn_arity(irn) - 1; i >= first; --i) {
 745                 ir_node  *op = get_irn_n(irn, i);
 746                 bitset_t *bs = (bitset_t*)get_irn_link(op);
 747
 748                 if (bs)
 749                         bitset_set(bs, get_irn_idx(irn));
 750         }
 751 }
 752
 753 /**
 754  * Verifies if collected count, number of edges in list and stored edge count are in sync.
 755  */
 756 static void verify_edge_counter(ir_node *irn, void *env)
 757 {
 758         build_walker *w = (build_walker*)env;
 759         if (IGNORE_NODE(irn))
 760                 return;
 761
 762         bitset_t *bs       = (bitset_t*)get_irn_link(irn);
 763         int       list_cnt = 0;
 764         int       edge_cnt = get_irn_edge_info(irn, EDGE_KIND_NORMAL)->out_count;
 765         const struct list_head *head
 766                 = &get_irn_edge_info(irn, EDGE_KIND_NORMAL)->outs_head;
 767
 768         /* We can iterate safely here, list heads have already been verified. */
 769         const struct list_head *pos;
 770         list_for_each(pos, head) {
 771                 ++list_cnt;
 772         }
 773
 774         /* check all nodes that reference us and count edges that point number
 775          * of ins that actually point to us */
 776         ir_graph *irg     = get_irn_irg(irn);
 777         int       ref_cnt = 0;
 778         bitset_foreach(bs, idx) {
 779                 int i, arity;
 780                 ir_node *src = get_idx_irn(irg, idx);
 781
 782                 arity = get_irn_arity(src);
 783                 for (i = 0; i < arity; ++i) {
 784                         ir_node *in = get_irn_n(src, i);
 785                         if (in == irn)
 786                                 ++ref_cnt;
 787                 }
 788         }
 789
 790         if (edge_cnt != list_cnt) {
 791                 w->problem_found = 1;
 792                 ir_fprintf(stderr, "Edge Verifier: edge count is %d, but %d edge(s) are recorded in list at %+F\n",
 793                         edge_cnt, list_cnt, irn);
 794         }
 795
 796         if (ref_cnt != list_cnt) {
 797                 w->problem_found = 1;
 798                 ir_fprintf(stderr, "Edge Verifier: %+F reachable by %d node(s), but the list contains %d edge(s)\n",
 799                         irn, ref_cnt, list_cnt);
 800         }
 801
 802         bitset_free(bs);
 803 }
 804
 805 int edges_verify(ir_graph *irg)
 806 {
 807         struct build_walker w;
 808         int    problem_found = 0;
 809
 810         /* verify normal edges only */
 811         problem_found  = edges_verify_kind(irg, EDGE_KIND_NORMAL);
 812
 813         w.kind          = EDGE_KIND_NORMAL;
 814         w.problem_found = 0;
 815
 816         /* verify counter */
 817         irg_walk_anchors(irg, clear_links, count_user, &w);
 818         irg_walk_anchors(irg, NULL, verify_edge_counter, &w);
 819
 820         return problem_found ? 1 : w.problem_found;
 821 }
 822
 823 typedef struct pass_t {
 824         ir_graph_pass_t pass;
 825         unsigned        assert_on_problem;
 826 } pass_t;
 827
 828 /**
 829  * Wrapper to edges_verify to be run as an ir_graph pass.
 830  */
 831 static int edges_verify_wrapper(ir_graph *irg, void *context)
 832 {
 833         pass_t *pass           = (pass_t*)context;
 834         int     problems_found = edges_verify(irg);
 835         /* do NOT rerun the pass if verify is ok :-) */
 836         assert(problems_found && pass->assert_on_problem);
 837         return 0;
 838 }
 839
 840 ir_graph_pass_t *irg_verify_edges_pass(const char *name, unsigned assert_on_problem)
 841 {
 842         pass_t *pass = XMALLOCZ(pass_t);
 843
 844         def_graph_pass_constructor(
 845                 &pass->pass, name ? name : "edges_verify", edges_verify_wrapper);
 846
 847         /* neither dump nor verify */
 848         pass->pass.dump_irg   = (DUMP_ON_IRG_FUNC)ir_prog_no_dump;
 849         pass->pass.verify_irg = (RUN_ON_IRG_FUNC)ir_prog_no_verify;
 850
 851         pass->assert_on_problem = assert_on_problem;
 852         return &pass->pass;
 853 }
 854
 855 void init_edges(void)
 856 {
 857         FIRM_DBG_REGISTER(dbg, DBG_EDGES);
 858 }
 859
 860 void edges_init_dbg(int do_dbg)
 861 {
 862         edges_dbg = do_dbg;
 863 }
 864
 865 void edges_activate(ir_graph *irg)
 866 {
 867         edges_activate_kind(irg, EDGE_KIND_NORMAL);
 868         edges_activate_kind(irg, EDGE_KIND_BLOCK);
 869         edges_activate_kind(irg, EDGE_KIND_DEP);
 870 }
 871
 872 void edges_deactivate(ir_graph *irg)
 873 {
 874         edges_deactivate_kind(irg, EDGE_KIND_DEP);
 875         edges_deactivate_kind(irg, EDGE_KIND_BLOCK);
 876         edges_deactivate_kind(irg, EDGE_KIND_NORMAL);
 877 }
 878
 879 void assure_edges(ir_graph *irg)
 880 {
 881         assure_edges_kind(irg, EDGE_KIND_BLOCK);
 882         assure_edges_kind(irg, EDGE_KIND_NORMAL);
 883         assure_edges_kind(irg, EDGE_KIND_DEP);
 884         add_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUT_EDGES);
 885 }
 886
 887 void assure_edges_kind(ir_graph *irg, ir_edge_kind_t kind)
 888 {
 889         if (!edges_activated_kind(irg, kind))
 890                 edges_activate_kind(irg, kind);
 891 }
 892
 893 void edges_node_deleted(ir_node *irn)
 894 {
 895         edges_node_deleted_kind(irn, EDGE_KIND_NORMAL);
 896         edges_node_deleted_kind(irn, EDGE_KIND_BLOCK);
 897         edges_node_deleted_kind(irn, EDGE_KIND_DEP);
 898 }
 899
 900 void edges_node_revival(ir_node *irn)
 901 {
 902         edges_node_revival_kind(irn, EDGE_KIND_NORMAL);
 903         edges_node_revival_kind(irn, EDGE_KIND_BLOCK);
 904 }
 905
 906 const ir_edge_t *(get_irn_out_edge_first_kind)(const ir_node *irn, ir_edge_kind_t kind)
 907 {
 908         return get_irn_out_edge_first_kind_(irn, kind);
 909 }
 910
 911 const ir_edge_t *(get_irn_out_edge_next)(const ir_node *irn, const ir_edge_t *last)
 912 {
 913         return get_irn_out_edge_next_(irn, last);
 914 }
 915
 916 ir_node *(get_edge_src_irn)(const ir_edge_t *edge)
 917 {
 918         return get_edge_src_irn_(edge);
 919 }
 920
 921 int (get_edge_src_pos)(const ir_edge_t *edge)
 922 {
 923         return get_edge_src_pos_(edge);
 924 }
 925
 926 int (get_irn_n_edges_kind)(const ir_node *irn, ir_edge_kind_t kind)
 927 {
 928         return get_irn_n_edges_kind_(irn, kind);
 929 }
 930
 931 static void irg_walk_edges2(ir_node *node, irg_walk_func *pre,
 932                             irg_walk_func *post, void *env)
 933 {
 934         if (irn_visited_else_mark(node))
 935                 return;
 936
 937         if (pre != NULL)
 938                 pre(node, env);
 939
 940         foreach_out_edge_kind_safe(node, edge, EDGE_KIND_NORMAL) {
 941                 /* find the corresponding successor block. */
 942                 ir_node *pred = get_edge_src_irn(edge);
 943                 irg_walk_edges2(pred, pre, post, env);
 944         }
 945
 946         if (post != NULL)
 947                 post(node, env);
 948 }
 949
 950 void irg_walk_edges(ir_node *node, irg_walk_func *pre, irg_walk_func *post,
 951                     void *env)
 952 {
 953         ir_graph *irg = get_irn_irg(node);
 954
 955         assert(edges_activated(irg));
 956         assert(is_Block(node));
 957
 958         ir_reserve_resources(irg, IR_RESOURCE_IRN_VISITED);
 959
 960         inc_irg_visited(irg);
 961         irg_walk_edges2(node, pre, post, env);
 962
 963         ir_free_resources(irg, IR_RESOURCE_IRN_VISITED);
 964 }
 965
 966 static void irg_block_edges_walk2(ir_node *bl, irg_walk_func *pre,
 967                                   irg_walk_func *post, void *env)
 968 {
 969         if (!Block_block_visited(bl)) {
 970                 mark_Block_block_visited(bl);
 971
 972                 if (pre)
 973                         pre(bl, env);
 974
 975                 foreach_out_edge_kind_safe(bl, edge, EDGE_KIND_BLOCK) {
 976                         /* find the corresponding successor block. */
 977                         ir_node *pred = get_edge_src_irn(edge);
 978                         irg_block_edges_walk2(pred, pre, post, env);
 979                 }
 980
 981                 if (post)
 982                         post(bl, env);
 983         }
 984 }
 985
 986 void irg_block_edges_walk(ir_node *node, irg_walk_func *pre,
 987                           irg_walk_func *post, void *env)
 988 {
 989         ir_graph *irg = get_irn_irg(node);
 990
 991         assert(edges_activated(irg));
 992         assert(is_Block(node));
 993
 994         ir_reserve_resources(irg, IR_RESOURCE_BLOCK_VISITED);
 995
 996         inc_irg_block_visited(irg);
 997         irg_block_edges_walk2(node, pre, post, env);
 998
 999         ir_free_resources(irg, IR_RESOURCE_BLOCK_VISITED);
1000 }